Improvement in metallic laths



UNITED STATES PATENT OFFICE.

JOHN B. CORNELL, OF NEV YORK, N. Y.

IMPROVEMENT IN METALLIC I ATHS.

Specification forming part of Letters Patent No. 20,629, dated June 22, 1858.

To all whom t may concern:

Be it known that I, JOHN B. CORNELL, of the city, county, and State of New York, have invented a new and Improved Plaster-Supporting metallic surface to be used in the construction of fire proof and burglarproof plastered partitions; and I do hereby declare that the following is a t'ull and exact description thereof, reference being had to the accompa-nying drawings, making a part of this specification- Figure l being a side view of a series of peculiarly-curved sheet-metal sections a c, combined with a couple of upright-s b l) in such a manner as to form my closely-united plastersupporting metallic surface; Fig. 2, a horizontal section in the line c ot' Fig. 1, and Fig. 3 a vertical section in the line y y of Fig. l.

The edges of the individual sections a d are of such a shape that when the said sections are combined with their supporting uprights or beams they will forni a double series of inner and outer recesses for the reception and retent-ion of the cement or plaster, or both, which may be combined therewith to form a fire-proof partition or ceiling.

Each edge of each sheet-metal section a has a double curve, Viz: longitudinal portions thereof are curved first inwardly and then outwardly, as represented in Fig. 3, thereby enabling the inwardly-incliningl portions of each section to form a plaster-retainin g recess between them, while the outwardly-inclining extreme edges of each pair of sections, when they are combined with their supporting uprights or beams, form between said edges another plaster receiving and retaining recess.

The first advantage resulting from this my improved form of the sections which compose my improved plaster-supporting metallic surface is that no outwardly-flaring recesses for the recept-ion and not the retention of the plaster are formed by the combination of said sections with their supports, and the second advantage resulting from said improvement consists in the fact that the series of recesses which are'formed in the central portion of each section may first be partially iilled with plaster-of-paris to prevent the passage of heat, and then the remaining portions of said recesses, together with the outer series of rel this Sth day of March, 1858.

JOHN B. CORNELL.

Witnesses:

Trios. CROCKER, A. A. J AYNE. 

